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IsActiveTree() indirectly calls active_tree_.get() in LayerTreeHostImpl.
Since std::unique_ptr::reset() nulls out its ptr before deleting the
owned object, IsActiveTree() will always be false, and the swap promises
will always be broken with ACTIVATION_FAILS. This causes
LayerTreeHostTestSwapPromiseDuringCommit to fail when the wait for main
frame or commit condition is removed from LayerTreeTest::EndTest().

R=danakj
BUG=703263

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I3819f76ab8f576c80faccf8db3ecd7ddb9b5954d
Reviewed-on: https://chromium-review.googlesource.com/1145920Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577696}